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NJM78M18FA
Product Overview
- Category: Voltage Regulator
- Use: To regulate and stabilize the output voltage in electronic circuits
- Characteristics:
- Fixed output voltage of 18V
- Low dropout voltage
- High ripple rejection ratio
- Thermal shutdown protection
- Package: TO-220F-4L (Plastic Package)
- Essence: Integrated circuit voltage regulator
- Packaging/Quantity: Available in reels or tubes, quantity depends on manufacturer
Specifications
- Input Voltage Range: 20V to 35V
- Output Voltage: 18V ± 4%
- Output Current: Up to 500mA
- Dropout Voltage: 2V (typical)
- Ripple Rejection Ratio: 60dB (typical)
- Operating Temperature Range: -40°C to +125°C
Detailed Pin Configuration
The NJM78M18FA has a standard TO-220F-4L package with the following pin configuration:
- Input Voltage (VIN)
- Ground (GND)
- Output Voltage (VOUT)
- Not Connected (NC)
Functional Features
- Provides a stable and regulated output voltage
- Protects against thermal overload with built-in thermal shutdown
- Filters out input voltage ripples for improved performance
- Suitable for various applications requiring a fixed 18V output
Advantages and Disadvantages
Advantages: - Fixed output voltage ensures stability in electronic circuits - Low dropout voltage minimizes power dissipation - High ripple rejection ratio improves signal quality - Thermal shutdown protection prevents damage due to overheating
Disadvantages: - Limited output current capacity (up to 500mA) - Requires an input voltage within a specific range (20V to 35V)
Working Principles
The NJM78M18FA is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a constant output voltage.
Detailed Application Field Plans
The NJM78M18FA can be used in various electronic applications, including: - Power supplies for audio amplifiers - Battery chargers - Industrial control systems - Automotive electronics - Instrumentation and measurement equipment
Detailed and Complete Alternative Models
- LM7818: Similar fixed 18V voltage regulator from Texas Instruments
- MC78M18: Another 18V voltage regulator from ON Semiconductor
- UA7818: Fixed 18V regulator from Fairchild Semiconductor
These alternative models provide similar functionality and can be used as replacements for the NJM78M18FA in various applications.
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Liste 10 perguntas e respostas comuns relacionadas à aplicação de NJM78M18FA em soluções técnicas
Sure! Here are 10 common questions and answers related to the application of NJM78M18FA in technical solutions:
Q: What is NJM78M18FA? A: NJM78M18FA is a voltage regulator IC that provides a fixed output voltage of 18V.
Q: What is the input voltage range for NJM78M18FA? A: The input voltage range for NJM78M18FA is typically between 20V and 35V.
Q: What is the maximum output current of NJM78M18FA? A: The maximum output current of NJM78M18FA is 500mA.
Q: Can NJM78M18FA handle higher input voltages than its output voltage? A: No, NJM78M18FA is designed to regulate the output voltage to a fixed 18V, so the input voltage should be lower than or equal to 18V.
Q: Is NJM78M18FA suitable for battery-powered applications? A: Yes, NJM78M18FA can be used in battery-powered applications as long as the input voltage does not exceed its specified range.
Q: Does NJM78M18FA require any external components for operation? A: Yes, NJM78M18FA requires input and output capacitors for stability and filtering purposes. Refer to the datasheet for recommended values.
Q: Can NJM78M18FA handle short-circuit conditions? A: Yes, NJM78M18FA has built-in short-circuit protection, which limits the output current to a safe level during a short circuit.
Q: Can NJM78M18FA operate in high-temperature environments? A: NJM78M18FA has a maximum operating temperature of 125°C, making it suitable for many high-temperature applications.
Q: Can NJM78M18FA be used in parallel to increase the output current? A: No, NJM78M18FA is not designed for parallel operation. Using multiple regulators in parallel can cause stability issues and should be avoided.
Q: Are there any alternatives to NJM78M18FA for regulating 18V? A: Yes, there are other voltage regulator ICs available in the market that can provide a fixed 18V output. Some popular alternatives include LM7818 and LT1086-18.
Please note that these answers are general and may vary depending on specific datasheet specifications and application requirements.